Apparatus for feeding powdered fuel



Jan. 22, 1929. 1,699,588

E. HERMSDORF APPARATUS FOR FEEDING POWDERED FUEL Filed Oct. 24, 1927 xl un.

b a l Inventor, Ewaldflamwdorf,

Abiorri Patented Jana22, 1929,

name STATES EWALD HERMSDORF, OE BRUNSWICK, GERMAQIY.

nrrnni'rus FOR FEEDING rownnann FUEL."

1 Application filed October 24, 1927, Serial No,

My invention relates to improvements in apparatus for feeding powdered fuel to a furnace, oven, or the like, and more partlcularl in apparatus of the type shown and de- 5 scri ed in the application for U. S. patent Ser. No. 743,120, filed October 11, 192 4, (patented Sept 11, 1928, Nor 1,684,320), in which the mixture of powdered fuel and air flows from a drum through a pipe disposed angularly of the said drum and into the combustion chamber. By thus deflecting the current of the mixture, the said current is obstructed within the laterally directed pipe,

so that a reaction is exerted on the blower sup- 1 plying the airto the mixing chamber.

The said reaction might be prevented by providin a fan at the joint of the drum and ipe. owever, thereby the pressure of the hlower would be increased, so that the ad- Vantage of the low pressure is lost. Therefore, for low pressure and large volumes of air the said fan can not be used.

The object of the improvements'is to provide an apparatus in which the reactionof (the air is prevented without materiall increasing the pressure, and with this 0 ject in view my invention consists in providing a deflecting wheel at the delivery end of the drum, the diameter of'the wheel being equal mi substantially equal to the diameter of the mixing drum.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanyingvdrawing. 85 Tu which the same letters of reference have been ,used in all tht views to indicate correspending parts. In said drawing,

Fig. 1, is a sectional elevation of the apparatus, and

Fig. 2, is a section taken on the line 2-2 of Fig. 1. i

1n the example shown in the drawing the apparatus comprises a mixing drum 1) dis posed with its axis horizontal, a receptacle 0 disposed above the said drum and containing powdered fuel, a blower 8 formed withhelical blades or a similar air compressor -1I11Xll1g chamber, means for supplying 228,421, and in Germany November 5, 1928,

adapted to supply a large volume of air under low pressure,and a pipe 1- directed downwardly from the drum 1) and communicatin therewith through an opening a, the sai pipe being adapted to direct the mixture of air and powdered fuel to the combustion chamber. The powdered coal is-supported within the receptacle 0 by means of a sieve 20 adapted to be acted upon by a hammer 'v, as has been described in the said prior application.

At the delivery end of the drum b a rotary deflectin wheel I is provided which is adapted to defl ect the current of air and powdered fuel from the drum 1) into the pipe 1'. As shown the said deflectingrwheel is mounted on the shaft to having the blowers mountedthereon, and it is provided with one or more blades t.

The mixture of powdered fuel and air is impelled by the blower 8 through the drum b and into the space occupied by the wheel Z,

and it is deflected by the blades of the said wheel downwardly and into the pipe 1'.-

1 The cross-sectional area of the opening a corresponds to'the. volume of air and fuel to be delivered from the drum 6.

I claim:

to furnaces, ovens, or the like, comprising a w dered fuel to said mixing chamber, a delii ry ipe disposed angularly of said mixing cham- An apparatus for feeding'powdered fuel;

er, means for producing a current of air through said chamber towards 'said delivery pipe, and a rotating auxiliary propelling member at the delivery "end of said mixing chamber for deflecting the current of air and fuel from the chamber to the delivery pipe, the said rotating member being adapted to direct the current ofair and fuel into the pipe without materially increasing the pressurethereof.

In testimony whereof I have aflixed my signature-- EWALD IiERMsDoRF. 

